Perenna Kei & family

NET WORTH: $1.3 billionAGE: 24The world's youngest billionaire title goes to Perenna Kei, who oversees an 85% stake in Logan Property Holdings through different companies and a family trust. Logan’s chairman and CEO, Ji Haipeng, is her father. One known under the name “Ji Peili," Kei is a non-executive director at the company, and holds a bachelor’s degree in economics and finance from the University of London.